All the most up to date B5 sets that I know of can be found in the B5 Mod.
I also have a shipset for a race I use in regular SE IV called the Shadri (I have both Gold and 1.49). Right now it is only posted here in the forums.
Shadri_Gold.zip
Shadri1.49_Update.zip
The 1.49 update just includes the AI and emp files for SE IV 1.49 (since the ships are in the Gold set alerady).